Vote Highlights Rift Between Union's Local and International Leadership

Boeing Co.'s largest union plans to hold a vote on a contract that would guarantee that the planned 777X jetliner would be assembled at unionized facilities in Washington state.

Frank Larkin, a spokesman for the international leadership of the International Association of Machinists and Aerospace Workers said the vote could take place as soon as Jan. 3. It would decide on a Boeing offer made early this month for a new eight-year...